Tax loss harvesting is worth roughly $1,000 a year to a typical attending in most years — real money, not life-changing money. The strategy works, the math is legitimate, and an entire industry of robo-advisors and direct-indexing products has built marketing around making it sound like much more than it is. For a physician in the 35% bracket, the dependable part of the benefit is the $3,000 annual deduction against ordinary income, worth $1,050 in federal tax. Everything beyond that is mostly deferral — pushing tax into the future, not erasing it — which has value, but a smaller and more conditional value than the pitch decks imply.
The honest framing matters because tax loss harvesting carries genuine failure modes: wash-sale violations that quietly void the deduction (including one involving your IRA that most physicians have never heard of), portfolio drift from swapping into imperfect substitutes, and hours spent optimizing an account too small for the optimization to matter.
This article sizes the benefit at physician tax rates, walks the rules, and — the part the industry skips — lists the situations where you should not bother.
What harvesting actually does
You sell a position in your taxable account that is worth less than you paid, realize the capital loss, and immediately buy a similar-but-not-identical fund so you stay invested. The realized loss then does three things, in order:
- Offsets capital gains, without limit (short-term losses against short-term gains first, long-term against long-term, then they cross-net).
- Offsets up to $3,000 of ordinary income per year ($1,500 married filing separately).
- Carries forward indefinitely to repeat steps 1 and 2 in future years.
Only this applies in taxable accounts. Losses inside your , 457(b), IRA, or are invisible to the IRS — there is nothing to harvest in retirement accounts.
The honest math at a 35% marginal rate
The $3,000 ordinary-income offset is the only part of the benefit taxed at your , and it is capped:
Example calculation
The dependable annual benefit, single attending, 35% bracket:
$3,000 ordinary-income offset × 35% = $1,050 of federal tax saved this year (plus state tax on $3,000, where applicable). That is the ceiling on the ordinary-income piece no matter how large the harvested loss — a $60,000 harvested loss still deducts only $3,000 against wages this year; the remaining $57,000 carries forward or waits for capital gains to offset.
The gains-offset piece is where overselling lives. Offsetting a long-term gain saves you 15–20% (plus the 3.8% net investment income tax for most attendings) today — but harvesting the loss also lowered your cost basis in the replacement fund by the same amount. When you eventually sell, the gain is larger by exactly the loss you harvested. You did not eliminate the tax; you moved it. The deferral is genuinely worth something through three mechanisms:
- Time value. Tax deferred is capital that keeps compounding for you in the meantime.
- Rate arbitrage. The $3,000 slice converts ordinary-rate savings now (35%) into extra long-term gains later (15–23.8%) — a real spread.
- The exits. Basis "deferral" becomes permanent elimination if the appreciated replacement shares are donated to charity or held until death (heirs receive stepped-up basis). For a physician who gives appreciated shares annually anyway, harvested losses genuinely never come back as tax.
Absent those exits, think of the gains-offset benefit as a low-single-digit-percent bonus on the harvested amount, not a windfall.
The wash-sale rule, including the IRA trap
A harvested loss is disallowed if you buy the same or a substantially identical security within 30 days before or after the sale — a 61-day window. The routine violations:
- Automatic dividend reinvestment. A reinvested dividend in the same fund inside the window washes a slice of your loss. Turn off automatic reinvestment in taxable holdings you may harvest, or check the dividend calendar first.
- Recurring purchases. Your automatic biweekly investment into the same fund — in any of your accounts — counts, including purchases before the sale.
- Your spouse's accounts. Purchases by your spouse (or by entities you control) count against your sale.
- The IRA trap. Buying the same security in your IRA or within the window washes the loss — and per IRS guidance (Rev. Rul. 2008-5), the disallowed loss is permanently destroyed rather than added to basis, because there is no taxable basis in the IRA to adjust. A 403(b) purchase of the identical fund sits in murkier territory; the conservative play is to avoid buying the harvested security in any account, retirement plans included, during the window.
"Substantially identical" is undefined in the regulations. The consensus practice: two broad index funds tracking different indexes (a total-market fund replaced with an S&P 500 fund) are fine; two funds tracking the same index from different sponsors is the gray zone most professionals avoid. Note the rule applies to securities; as of mid-2026, it still does not reach crypto and other digital assets — proposals to extend §1091 have circulated for years without being enacted, so treat that gap as open but not permanent.
Important
A washed loss is not a penalty event — the loss is just disallowed (and usually folded into the new shares' basis, except in the IRA case, where it evaporates). The real cost is that your 1099-B and your assumptions no longer match, and an automated investing habit can quietly wash losses all year.
When it is NOT worth doing
This is the section the marketing omits. Skip harvesting, or deprioritize it, when:
Your taxable account is small. With $40,000 in taxable holdings, a 15% drawdown gives you a $6,000 paper loss — and only if you bought at the exact top. Harvest it and you have captured $1,050 of year-one value (the $3,000 offset, twice over two years). Worth taking if it is sitting there, not worth building systems around. Physicians early in the attending years should put the energy into maxing the 403(b), HSA, and — accounts where the tax benefit is structural, not situational.
There are no losses. Obvious but ignored: in steadily rising markets, a buy-and-hold taxable account quickly has no lots below basis. Harvesting is episodic — it pays in volatile years and goes dormant for long stretches. A strategy that produced losses to harvest every single year would be a portfolio problem, not a tax triumph.
You have no gains to offset and a big carryover already. Once you are sitting on, say, a $90,000 loss carryforward with no realized gains in sight, additional harvesting adds nothing for 30 years at $3,000 per year. The marginal harvest is worthless until you have gains.
You expect lower rates soon. Deferral works when today's rate exceeds tomorrow's. A physician two years from retiring into the 0% or 15% long-term gains bracket may be better served harvesting gains at the low rate later than harvesting losses at the cost of lower basis now.
The replacement degrades the portfolio. If avoiding "substantially identical" pushes you into a fund with higher expenses or meaningful tracking difference, the tax tail is wagging the portfolio dog. The investment plan outranks the tax optimization.
Quick takeaway
Tax loss harvesting is a bonus round, not a pillar. It never justifies holding a worse portfolio, realizing losses you would not otherwise take on merit, or — most common — spending attending-level hours to capture resident-level dollars.
If you do it: clean execution
For a physician running a simple two-or-three-fund taxable portfolio, good execution looks like:
- Pre-select replacement pairs before you need them (total US market ↔ S&P 500; total international ↔ developed-markets fund), so a volatile week requires no research.
- Use specific-lot identification (set it as your account default now), so you sell only the lots below basis instead of averaging away the loss.
- Turn off dividend reinvestment in taxable; sweep dividends to cash and invest manually.
- Before selling, check the last 30 days of purchases across every household account — including IRAs — and pause automatic buys of that fund for 31 days after.
- Harvest meaningfully sized losses (a four-figure loss, not a $40 one) when markets hand them to you; do not check daily.
Robo-advisors and direct-indexing products automate this competently and genuinely harvest more granular losses. Whether that is worth a 0.25–0.40% annual fee on the whole account — paid every year, including the many years with nothing to harvest — is a math problem that usually favors doing it yourself at physician portfolio sizes, and the exit problem is real: leaving a direct-indexing product later means untangling hundreds of individual positions.
Common questions
Do harvested losses reduce my net investment income tax?
Yes — capital losses net against the capital gains that feed the 3.8% NIIT, so offsetting a gain saves up to 23.8% federal for most attendings, not just 15–20%.
Can I harvest losses in my 403(b) or backdoor Roth?
No. Gains and losses inside are not reportable, so there is nothing to harvest — and as covered above, those accounts can wash your taxable-account losses if they buy the same fund inside the window.
What happens to unused losses if I have a huge carryforward?
They carry forward indefinitely during your lifetime, offsetting future gains plus $3,000 of ordinary income per year. They do not transfer to heirs, and a carryforward you never use was a loss you realized for nothing — another reason not to manufacture giant harvests without a use for them.
Is selling at a loss just locking in losses?
No — done correctly you are out of the market for zero days. You sell fund A and buy similar-but-not-identical fund B the same hour. Market exposure is continuous; only the tax lot changed. The mistake is harvesting into cash and waiting, which converts a tax strategy into market timing.
Does my state allow the $3,000 offset?
Most conform to federal treatment, but several handle capital losses differently — for example, states that tax investment income under separate rules or disallow loss carryforwards. Pennsylvania is the standing example: its separate income-class system means capital losses cannot offset your compensation at all and do not carry forward to future years. Check your state's treatment before counting the state-level savings.
What to do next
- Check your taxable account size and unrealized positions. No taxable account, or nothing below basis? Close this tab and fund your HSA.
- Set cost-basis method to specific-lot identification and turn off dividend reinvestment in taxable holdings.
- Write down your replacement-fund pairs once, so future volatility requires execution, not deliberation.
- List every household account that could trigger a wash sale — spouse's brokerage, both IRAs, automatic purchase schedules.
- Then leave it alone until the market hands you a meaningful loss.
If your accounts are connected in Attending Financial, the dashboard shows your taxable balance alongside unrealized positions — a thirty-second check on whether this strategy is sized to matter for you this year.